|
Age at start of expansion (years)
|
Mean ± SD
|
27.0 ± 9.4
|
26.1 ± 8.2
|
41.2 ± 20.9
|
| |
Range
|
17.1–56.0
|
17.1–47.5
|
26.4–56.0
|
|
Sex
|
Male
|
8
|
6
|
2
|
| |
Female
|
26
|
26
|
0
|
|
Angle classification
|
Class I
|
6
|
5
|
1
|
| |
Class II/1
|
20
|
20
|
0
|
| |
Class II/2
|
6
|
5
|
1
|
| |
Class III
|
2
|
2
|
0
|
|
Posterior occlusion
|
Unilateral crossbite
|
14
|
13
|
1
|
| |
Bilateral crossbite
|
4
|
4
|
0
|
| |
Anticipated crossbite
|
12
|
12
|
0
|
| |
Constriction without crossbite
|
4
|
3
|
1
|
|
Skeletal maturation stage
|
CVM4
|
3
|
3
|
0
|
| |
CVM5
|
12
|
12
|
0
|
| |
CVM6
|
19
|
17
|
2
|